Page 4 of 37
TYRE PRESSURE MONITOR
Fault finding - Introduction
35B
35B-3
UCH
Program no.: 350 and higher
Vdiag No: 48-4C-4D-4F-50
To cut off + after ignition, proceed as follows:
–Disconnect the diagnostic tool.
–Press the Start button twice briefly (less than 3 seconds),
–See that the + after ignition feed has been cut off by checking that the computer warning lights on the
instrument panel have gone out.
Faults
The current status of faults must be considered when the diagnostic tool is used following switching to + after
ignition (with no action on the system components).
For a present fault, handle the fault according to the procedure listed in the section on Interpretation of faults in
Workshop Repair Manual 372 Section 87B Passenger compartment connection unit.
There is no stored fault on the tyre pressure monitor.
Conformity check
The aim of the conformity check is to check statuses and parameters that do not produce a fault display on the
diagnostic tool when they are inconsistent. Therefore, this stage is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer
complaint.
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section features the fault finding procedure for statuses and parameters, and the conditions for checking them.
If a status is not operating normally or a parameter is outside permitted tolerance values, you should consult the
corresponding fault finding page.
Customer complaints - Fault finding chart
If the check using the diagnostic tool is satisfactory but the customer complaint is still present, the fault should be
treated as a customer complaint.
A summary of the overall procedure to follow is provided on the following page
in the form of a flow chart.
Edition 4
Page 30 of 37
TYRE PRESSURE MONITOR
Fault finding - Customer complaints
35B
UCH
Program no.: 350 and higher
Vdiag No: 48-4C-4D-4F-50TYRE PRESSURE MONITOR
Fault finding - Customer complaints
NO DIALOGUE WITH THE UCH COMPUTER ALP 1
"READJUST TYRE PRESSURE" MESSAGE LIGHTS UP ALP 2
"ELECTRONIC FAULT" MESSAGE LIGHTS UP ALP 3
"TYRE SENSOR OUT OF ORDER" MESSAGE LIGHTS UP
with disappearance of a single wheel warning light ALP 4
with disappearance of the four wheel warning lights ALP 5
intermittent warning ALP 6
"PUNCTURE - CHANGE TYRE" MESSAGE LIGHTS UP ALP 7
Edition 435B-29
Page 31 of 37
TYRE PRESSURE MONITOR
Fault finding - Fault Finding Chart
35B
UCH
Program no.: 350 and higher
Vdiag No: 48-4C-4D-4F-50TYRE PRESSURE MONITOR
Fault finding - Fault Finding Chart
ALP 1 No dialogue with the computer
NOTESNone
Try the diagnostic tool on another vehicle.
Make sure the tool update version is more recent than CD-ROM No. 32.
Check:
–the connection between the diagnostic tool and socket (connection and cable in good condition).
–the computer power supply
–the engine and passenger compartment fuses.
Make sure that the CLIP sensor is fed by tracks 16 (+ 12 V), 4 and 5 (earth) of the diagnostic socket, which
can be seen by the two red warning lights on the sensor lighting up.
Make sure that the CLIP sensor is connected to the computer's USB port.
Make sure that the CLIP sensor is communicating properly with the vehicle's computers; this can be seen by
the two green diodes on the sensor lighting up.
Check the following tracks on the diagnostic socket:
track 1 + After ignition feed
track 16 + battery feed
tracks 4 and 5 Earth
Repair if necessary.
Check the continuity, insulation and absence of interference resistance on lines:
multiplex line H (diagnostic socket track 6)
multiplex line L (diagnostic socket track 14)
With a multimeter, make sure that the voltages at the diagnostic socket terminals are:
–2.5 V between CAN H (track 6) and the earth (tracks 4 and 5)
–2.5 V between CAN L (track 14) and the earth (tracks 4 and 5)
If dialogue with the UCH still has not been established after all the checks, contact your Techline.
AFTER REPAIRCheck that no faults are still present.
Check that the system is operating correctly.
SSPP_V48_ALP01 /SSPP_V4C_ALP01/SSPP_V4D_ALP01/SSPP_V4F_ALP01/SSPP_V50_ALP01
Edition 4
35B-30
Page 34 of 37
TYRE PRESSURE MONITOR
Fault finding - Fault Finding Chart
35B
UCH
Program no.: 350 and higher
Vdiag No: 48-4C-4D-4F-50
ALP 4"Tyre sensor inoperative" message lights up (wheel warning light
disappears)
NOTESCheck that all the faulty tyres are fitted with tyre pressure monitor valves.
Has one of the wheels been replaced with
the spare?YES
NO
Program the four valve codes with command
SC002 Program the four valve codes.
Did the programming procedure go
properly?
NO YES
End of fault finding
Replace the faulty valve.
Do the necessary work
on the wheel with a tyre
pressure monitor valve,
then refit it on the vehicle
AFTER REPAIRCarry out a complete check with the diagnostic tool.
35B-33
SSPP_V48_ALP04 /SSPP_V4C_ALP04/SSPP_V4D_ALP04/SSPP_V4F_ALP04/SSPP_V50_ALP04
Edition 4
Page 35 of 37
TYRE PRESSURE MONITOR
Fault finding - Fault Finding Chart
35B
ALP 5"Tyre sensor inoperative" message lights up (four wheel symbol
warning lights disappear)
NOTESCheck that all the faulty tyres are fitted with tyre pressure monitor valves.
Are the wheels fitted with tyre pressure
monitor valves?NO
YES
Check the configuration of the Tyre Pressure
Monitor in the UCH (LC017 Tyre Pressure
Monitor Function).
Is the UCH set to "With" for the Tyre Pressure
Monitor function?NO
YES
NO
Have the valve codes been programmed?
YES
Make sure the ABS is transmitting the vehicle
speed (PR008 Vehicle speed).
YES
Is there an ABS fault?
UCH fault, contact the Techline.
Program the four valve codes with command
SC002 Program the four valve codes.
Is the vehicle equipped with the Tyre
Pressure Monitor option?
YES NO
Install the Tyre Pressure
Monitor valves.
Deconfigure the Tyre Pressure Monitor in the
instrument panel.
Configure the UCH with the Tyre Pressure
Monitor function by using command CF023 Tyre
Pressure Monitor function under SC008 UCH
type.
Run full fault finding on the ABS.
UCH
Program no.: 350 and higher
Vdiag No: 48-4C-4D-4F-50
AFTER REPAIRCarry out a complete check with the diagnostic tool.
35B-34
SSPP_V48_ALP05 /SSPP_V4C_ALP05/SSPP_V4D_ALP05/SSPP_V4F_ALP05/SSPP_V50_ALP05
Edition 4
